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Ubuntu 14.04 LTS: USN-2840-1 Urgent: Kernel Memory Exposure Vulnerability

ubuntu
Calendar Grey December 1, 2015
Scroller Ubuntu
Ubuntu Security Notice USN-5001-3 tackles a kernel vulnerability that could result in system instability in particular scenarios.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux-lts-utopic: Linux hardware enablement kernel from Utopic

Details:

Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted

to garbage collect incompletely instantiated keys. A local unprivileged

attacker could use this to cause a denial of service (system crash).

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu system crash linux-lts-utopic

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
  linux-image-3.16.0-55-generic   3.16.0-55.74~14.04.1
  linux-image-3.16.0-55-generic-lpae  3.16.0-55.74~14.04.1
  linux-image-3.16.0-55-lowlatency  3.16.0-55.74~14.04.1
  linux-image-3.16.0-55-powerpc-e500mc  3.16.0-55.74~14.04.1
  linux-image-3.16.0-55-powerpc-smp  3.16.0-55.74~14.04.1
  linux-image-3.16.0-55-powerpc64-emb  3.16.0-55.74~14.04.1
  linux-image-3.16.0-55-powerpc64-smp  3.16.0-55.74~14.04.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

https://ubuntu.com/security/notices/USN-2824-1

CVE-2015-7872

Severity
critical
Lowest
Low
Medium
High
Critical

December 01, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu system crash linux-lts-utopic

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-55.74~14.04.1

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